[postgis-devel] design of SERIALIZED_LWGEOM/LWGEOM/PG_LWGEOM

[jiong]

I am reading postgis code of function LWGEOM_in: 
in older version: wkt -> PG_LWGEOM
in newer version: wkt -> SERIALIZED_LWGEOM -> LWGEOM -> PG_LWGEOM 

So my question are: 

(1)SERIALIZED_LWGEOM and PG_LWGEOM have the same serialized format except
for the member of size's position? 
(2) if SERIALIZED_LWGEOM for code isolation of parser and postgis, why not
use
wkt -> SERIALIZED_LWGEOM -> PG_LWGEOM directly?

any idea?
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